Medical Millex-GS Syringe Filter Unit, 0.22 µm, mixed cellulose esters, 33 mm, sterilized by EtO. Compare. Product No. Description. SDS. Pricing. SLGSM33SS. A 33 mm diameter sterile syringe filter with a 0.22 µm pore size Mixed Cellulose Esters membrane. Comes in a pack of 50.